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Transparent NAT Between IPv6 and IPv4

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1. Cisco Systems Confidential. 0081_08F8_c1. Transparent. NAT Between. IPv6 and IPv4. Pedro Roque ... It effectively expands the address space as a small number ... – PowerPoint PPT presentation

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Title: Transparent NAT Between IPv6 and IPv4


1
Transparent NAT Between IPv6 and IPv4
  • Pedro Roqueroque_at_cisco.com

2
Transparent NAT
IPv6
IPv4
IPv6 Host
IPv4 Host
  • Transparent to hosts
  • Bidirectional
  • Access from the IPv6 cloud to IPv4 servers
  • Access from the IPv4 cloud to IPv6 servers

3
Advantages
  • It effectively expands the address space as a
    small number of IPv4 addresses can serve an IPv6
    cloud
  • Translation router can be placed anywhere on the
    network
  • Upper layer protocol translation

4
IPv6 Client to IPv4 Server
50003000abcd1234/128 to 192.2.3.4/128 source
address pool10.0.0.0/8
IPv4 Host
IPv6
IPv6 Host
IPv4 Internet
5f006d00000ffff0/96 to 0.0.0.0/0 source
address pool 171.69.0.0/28
5
IPv4 Client to IPv6 Server
6
Implementation
  • Cisco has made a prototype available at the end
    of July 97
  • Translates
  • Regular TCP/UDP
  • FTP (RFC 959) from/to FOOBAR (RFC 1639)
  • ICMP echo
  • ICMP error messages

7
Summary
  • Equivalent solution to the deployed IPv4 NAT
    solutions, in terms of benefits and drawbacks
  • Transparent NAT doesnt require explicit IETF
    standardization effort
  • IETF could revise protocols like FTP to make
    them more translation friendly
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